Memorising molar equations physics A level

Hi,

Are there any acronyms for easy memorisation of
- No. of particles = moles x Avogadros constant
- Mass = moles x molecular mass?

Thanks

Reply 1

Nitrotoluene

Original post by AA67

Hi,
Are there any acronyms for easy memorisation of
- No. of particles = moles x Avogadros constant
- Mass = moles x molecular mass?
Thanks

I would like to suggest the following:
You could use the acronym "N.M.A" for the first formula and "M.M.M" for the second to make them easier to remember.
1. Number of particles = Moles × Avogadro's constant

•

N = M × A

•

N = Number of particles

•

M = Moles

•

A = Avogadro's constant (6.022 × 10^23)

Mnemonic: "Never Miss Avogadro" (N.M.A)

2. Mass = Moles × Molar mass (or Molecular mass)

•

M = n × M

•

M = Mass (in grams)

•

n = Moles

•

M = Molar mass (g/mol)

Mnemonic: "Moles Make Mass" (M.M.M) or "Moles Make Molecules" (if dealing with molecular substances).

My 2 cents!

(edited 3 weeks ago)

Reply 2

Alex_H_

Original post by AA67

Hi,
Are there any acronyms for easy memorisation of
- No. of particles = moles x Avogadros constant
- Mass = moles x molecular mass?
Thanks

If you are provided the value of Avogadro's constant and molecular mass on the formula sheet or in the questions then another way to help to remember the formulas is to look at the units.

Moles has the units mol
Avogadro's constant has the units mol-1
Multiply these together and the units cancel which has the same (no units) as number of particles.

Moles has the units has mol
Molecular mass has the units kg/mol
Multiply these together and the resulting unit in kg the same as mass.